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by BlastRoom
Mercator, Robinson, Peters and azimuthal projections, and what each one gets wrong.
#us_hs_world_geography
20 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
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On a world map, every meridian and parallel is a straight line, and Greenland looks nearly as large as Africa. The map uses which projection?
A world map has a rounded oval outline with curved meridians and is designed as a compromise, not to keep any one property exact. Which projection is it?
A rectangular world map shows continents in their true share of Earth's surface, but many landmasses look stretched north-south. Which projection is it?
A circular map centered on the North Pole has meridians radiating outward like spokes from the center. Which projection is it?
A map centered on Chicago shows routes to other cities as straight lines radiating from Chicago, but continents near the edge are stretched. Which projection is it?
A rectangular world map keeps landmass shapes fairly recognizable near the equator, but high-latitude regions are greatly enlarged. Which projection is it?
On a Mercator projection, Antarctica and Greenland look much larger than their true share of Earth's surface. Which property is distorted?
The Peters projection preserves each country’s relative area. What property does it sacrifice most visibly when landmasses look stretched or squashed?
A Robinson projection is not reliable for measuring the exact miles between two cities on different continents. Which property does this problem show is distorted?
On an azimuthal map centered on one point, the outlines of places far from the center look warped and stretched around the edge. Which property does this warping show is distorted?
A Mercator map keeps compass direction useful for straight-line sailing, but a straight route drawn across high latitudes is not the shortest path. Which property does this route problem show is distorted?
On a Peters equal-area map, compass bearings between cities are not kept as true straight lines. Which property does this problem show is distorted?
A sailor using compass bearings wants a straight line on the map to show a constant direction across the ocean. Which projection best fits?
A teacher wants students to compare Africa’s land area with Europe’s without high-latitude exaggeration. Which projection best fits?
An airline map for routes from a single hub wants distances and directions from that hub shown most accurately. Which projection best fits?
A classroom wall map needs a balanced view of the whole world, with no single property perfect but overall distortion reduced. Which projection best fits?
Why must any flat world map distort at least one property of Earth's surface?
A projection can keep areas proportional or keep local shapes, but it cannot keep both perfectly across the whole globe. What explains this trade-off?
Why do distortions often grow toward the edge of many world maps?
A student says, “Use a bigger sheet of paper, and the world map will have no distortion.” Why is that incorrect?
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Time Zones and the International Date Line
20 questions
